How are asteroid belts and exploration sites generated

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Are asteroid belts and exploration sites always consistent within a system? Or do they change from time to time.

Specifically about exploration sites, are there guaranteed to always be exploration sites in each system? e.g. if I use my scanner probes and find nothing, is that just because my skill isn't high enough – or do some systems just not have exploration sites sometimes?

And specifically about asteroid belts, do they change what types of asteroids exist within the system? Or do asteroid fields change up their composition – or sometimes switch to ice fields?

Best Answer

Asteroid belts do not change, they are simply refreshed every downtime. (May be different in Sov nullsec with Ore Upgrades). They never change to ice belts.

Exploration sites are not guaranteed to be in a system at any point in time. I believe there are X number of sites per constellation ( or region ) at any one point in time.

Outside of sovereign nullsec ( with infrasture hub upgrades), players have little control over exploration sites, other than spawning them ( which will start the de-spawn timer ) and running them ( which de-spawns them rather quickly ).